Beware of the dancing bunnies

Larry Osterman's WebLog: "Beware of the dancing bunnies.
I saw a post the other day (I'm not sure where, otherwise I'd cite it) that proclaimed that a properly designed system didn't need any anti-virus or anti-spyware software.
Forgive me, but this comment is about as intellegent as 'I can see a worldwide market for 10 computers' or 'no properly written program should require more than 128K of RAM' or 'no properly designed computer should require a fan'."